Beamforming Feedback Quantization Using Equal Bit Resolution
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Solution Overview
Problem
Existing beamforming standards, such as 802.11ac/n, require different bit resolutions for phi and psi angles in Givens rotations, leading to unnecessary quantization overhead and potential performance degradation due to the emphasis on psi angles over phi angles.
Innovation Solution
Equalizing the bit resolution for both phi and psi angles in beamforming quantization, using bϕ = bΨ, to reduce feedback overhead while maintaining performance, by adjusting the number of bits used for quantization in accordance with the specified standards for single-user and multi-user MIMO scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different bit resolutions are used for phi and psi angles in Givens rotations, then measurement precision is improved for psi angles, but feedback overhead increases
Solution Approach 1:
The patent changes the quantization parameter allocation from unequal (different bit resolutions for phi and psi) to equal (same bit resolution for both angles). This parameter change reduces feedback overhead while maintaining adequate precision for both angle types through uniform quantization binning.
2Reliability
If higher bit resolution is used for psi angles, then beamforming performance is improved, but feedback overhead increases
Solution Approach 1:
The patent equalizes the bit resolution parameter for both phi and psi angles, changing from a differentiated allocation (more bits for psi) to uniform allocation. This reduces the total feedback overhead while simulations show minimal performance degradation (0.3 dB), effectively resolving the contradiction between performance and overhead.
3Device complexity
If unequal quantization is applied to phi and psi angles, then device complexity is reduced through simplified processing, but measurement precision deteriorates
Solution Approach 1:
The patent applies homogeneous quantization to both phi and psi angles, using the same bit resolution and quantization methodology for both angle types. This uniform approach simplifies the processing logic (comparing both angles with identical precision rules) while ensuring neither angle suffers from inadequate precision.
Data Source
AI summary
An embodiment method for beamforming feedback includes receiving a sounding packet for a beamforming transmission, performing planar rotation in accordance with the sounding packet to generate phi and psi angle values, quantizing the phi and psi angle values to a same bit resolution, and feeding back the quantized phi and psi angle values.